This view of layered rocks on the floor of McLaughlin Crater shows sedimentary rocks that contain spectroscopic evidence for minerals formed through interaction with water. The High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter recorded the image.
A combination of clues suggests this 1.4-mile-deep (2.2-kilometer-deep) crater once held a lake fed by groundwater. Part of the evidence is identification of clay and carbonate minerals within layers visible near the center of this image. The mineral identifications come from the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM), also on the Mars Reconnaissance Orbiter.
The scene covers an area about one-third of a mile (about 550 meters) across, at 337.6 degrees east longitude, 21.9 degrees north latitude. North is up. Figure 1 [the second, annotated image above] indicates the location of layers bearing clay and carbonate minerals and includes a scale bar of 100 meters (328 feet).
Photo credit: NASA/JPL-Caltech/University of Arizona
Notes: For more information, see Layers with Carbonate Content Inside McLaughlin Crater on Mars. Unfortunately, these images are very low resolution, especially when compared to the very high resolution, very beautiful images the HiRISE team normally provides; however, this is the highest resolution NASA is releasing at this time.